nothing is tested and that's kind of terrible

[lithp]

what would it mean to test any of this? e.g. what should happen when the provider gives us an error?

[lithp]

The template provided here makes testing look a lot easier than I was expecting. It's still not easy to embed colors in the tests while keeping them human-readable but that's a tooling issue.

With a little bit of factoring the UI can be turned into a pure function from UIState -> terminal buffer, or for more thorough testing it's probably preferable to factor into a pure function from a sequence of UIMessage -> terminal buffer. It should then be easy to write nice readable tests which turn some state (e.g. a block w no txns is selected) into expected terminal buffers.

Currently the entire screen is rendered every frame, though a casual reading of this makes it seem that moving to partial redraws won't require changing this test framework.